DisplayPort not working on i-tec dock using DisplayLink

[AW_DisplayLink]

I am using DisplayLink
displaylink.com/downloads/macos
with i-tec CADUA4KDOCKPDL
i-tec.cz/de/produkt/cadua4kdockpdl-3/
displaylink driver 5.1.40
on Mojave 10.14.5
on iMac 2017 4K 21,5inch

Connecting a monitor ASUS ROG PG27A to outputs DisplayPort zone 1 or 2 on dock CADUA4KDOCKPDL this monitor does not see/recognize signal DP and remains black.

I have some other signal sources with DisplayPort. Connecting the monitor ASUS ROG PG27A with DisplayPort to these sources. No problems with DP on ASUS ROG PG27A.

I have an an adapter USB 3.1 Type C to DisplayPort 1.2
https://www.club-3d.com/en/detail/2350/
With this adapter I can connect monitor ASUS ROG PG27A with DisplayPort 3840x2160 60Hz to the iMac. What is I wanted from the dock.

i-tec CADUA4KDOCKPDL using driver DL is the only source DP not recognized by monitor ASUS ROG PG27A.

Why? Is this the driver? Or the dock?

I already resetted the monitor and switched off deep sleep modes on Asus.


How to get DisplayPort working on docking station CADUA4KDOCKPDL with monitor ASUS ROG PG27A ?